diff --git a/mgw/MGCP_Test.ttcn b/mgw/MGCP_Test.ttcn
index 1a45015..b46b178 100644
--- a/mgw/MGCP_Test.ttcn
+++ b/mgw/MGCP_Test.ttcn
@@ -1968,7 +1968,7 @@
 		f_vty_transceive(MGWVTY, "mgcp");
 		f_vty_transceive(MGWVTY, "rtp-patch rfc5993hr");
 
-		/* from us to MGW */
+		/* Connection #0 (Bidirectional) */
 		flow[0] := valueof(t_RtpFlow(mp_local_ip, mp_remote_ip, 111, "GSM-HR-08/8000"));
 		/* bind local RTP emulation sockets */
 		flow[0].em.portnr := 10000;
@@ -1978,7 +1978,7 @@
 		flow[0].rtp_cfg.tx_fixed_payload := '0b11b3eede60be4e3ec68838c7b5'O;
 		f_flow_create(RTPEM[0], ep, call_id, "sendrecv", flow[0]);
 
-		/* from MGW back to us */
+		/* Connection #1 (Bidirectional) */
 		flow[1] := valueof(t_RtpFlow(mp_local_ip, mp_remote_ip, 111, "GSM-HR-08/8000"));
 		flow[1].em.portnr := 20000;
 		flow[1].rtp_cfg	:= c_RtpemDefaultCfg;
@@ -1987,17 +1987,31 @@
 		flow[1].rtp_cfg.tx_fixed_payload := '000b11b3eede60be4e3ec68838c7b5'O;
 		f_flow_create(RTPEM[1], ep, call_id, "sendrecv", flow[1]);
 
-		f_rtpem_mode(RTPEM[1], RTPEM_MODE_BIDIR);
-		f_rtpem_mode(RTPEM[0], RTPEM_MODE_BIDIR);
-
+		/* Send RTP packets to connection #0, receive on connection #1 */
+		f_rtpem_mode(RTPEM[1], RTPEM_MODE_RXONLY);
+		f_sleep(0.5);
+		f_rtpem_mode(RTPEM[0], RTPEM_MODE_TXONLY);
 		f_sleep(1.0);
+		f_rtpem_mode(RTPEM[0], RTPEM_MODE_NONE);
+		f_sleep(0.5);
+		f_rtpem_mode(RTPEM[1], RTPEM_MODE_NONE);
 
+		/* Send RTP packets to connection #1, receive on connection #0 */
+		f_rtpem_mode(RTPEM[0], RTPEM_MODE_RXONLY);
+		f_sleep(0.5);
+		f_rtpem_mode(RTPEM[1], RTPEM_MODE_TXONLY);
+		f_sleep(1.0);
+		f_rtpem_mode(RTPEM[1], RTPEM_MODE_NONE);
+		f_sleep(0.5);
+		f_rtpem_mode(RTPEM[0], RTPEM_MODE_NONE);
+
+		/* Remove RTP flows and check statistics */
 		f_flow_delete(RTPEM[0]);
 		f_flow_delete(RTPEM[1], ep, call_id);
 
+		/* Check for errors */
 		stats[0] := f_rtpem_stats_get(RTPEM[0]);
 		stats[1] := f_rtpem_stats_get(RTPEM[1]);
-
 		f_rtpem_stats_err_check(stats[0]);
 		f_rtpem_stats_err_check(stats[1]);